from time import time
st=time()
with open ('m2_reverse.txt')as f:
    a = []
    for line in f:
        a.append([int(x) for x in line.split()])
for i in range (len(a)):
    for j in range (len(a)-i-1):
        if a[j]> a [j+1]:
            a[j],a[j+1]=a[j+1],a[j]
print(a)
fi=time ()
t=fi - st
print (t)
